CVE Catalog

CVE-2005-1021

High
Published: Translated: NVD NIST

Summary

A memory leak in Secure Shell (SSH) in Cisco IOS versions 12.0 through 12.3, when authenticating against a TACACS+ server, allows remote attackers to cause a denial of service (memory consumption) via an incorrect username or password.

Risk Assessment

The risk is that a remote attacker can cause a network device to crash due to memory exhaustion, potentially disrupting network operations and service availability.

Recommendation

It is recommended to upgrade Cisco IOS to a version later than 12.3, which includes a fix for the memory leak. If an upgrade is not possible, consider restricting SSH access or using alternative authentication methods.

Related vulnerabilities

Original NVD description (English source)

Memory leak in Secure Shell (SSH) in Cisco IOS 12.0 through 12.3, when authenticating against a TACACS+ server, allows remote attackers to cause a denial of service (memory consumption) via an incorrect username or password.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS